Automatic electric cut-out for magneto-bells



(No Model.)

J. z. MILLER. 4 AUTOMATIC ELECTRIC GUT-OUT FOR MAGNBTO BELLS.

Patented Feb. 2, 1897.

I WITNESSES, m

UNITED STATES PATENT QFFICE.

.IOI'IN, Z. MILLER, OF BALTIMORE, MARYLAND.

AUTOlVlATlC ELECTRIC CUT-OUT FOR MAGNETO-BELLS.

SPECIFICATION forming part of Letters Patent N 0. 576,372, datedFebruary 2, 1897.

Application filed September 23,1896. Serial No. 606,746. No model.)

To all whom it may concern:

Be it known that I, JOHN Z. MILLER, a citizen of the United States,residin gin the city of Baltimore, State of Maryland, have invented anew and useful Improvement in Automatic Electric Cut-Outs forMagneto-Bells; and I do hereby declare the following to be a full,clear, and exact description of the same,- reference being had to theaccompanying drawings, in which- Figure I represents a portion of myelectric cut-out in rear view. Fig. II represents portions of thecut-out in top View, partly in longitudinal section; and Fig. III is afront View of the main wheel and shifting-cam.

This invention relates to that class of electrical appliances in whichamagneto-generator is operated by a crank to produce a current, and aswitch of some kind is used to introduce this current to the wire of thecallbell of a telephone-circuit; and the object of the invention is toproduce mechanical means adapted for attachment to any bell forautomatically cutting into the telephone-circuit both sides of themagneto-generator bell by the act of turning the magneto bell-crank andof cutting out the said generator by the act of releasing thebell-crank.

To this end my invention consists in the construction and combination ofparts forming an automatic electric cut-out for magnetobells hereinafterdescribed and claimed, reference being had to the accompanying draw-Ings.

represents the main drive wheel to be connected with a magneto-generatorfor mechanically rotating the same by suitable gearing for the purposeof generating a magnetic current.

6 represents the shaft of the drive-wheel, journaled in any suitablebearings 7 8. The crank 9 is fixed to a small shaft 10, which may haveone bearing 11 in the casing, but its body is fitted to revolve freelywithin the main shaft G. 011 the shaft is fitted a camwheel 12, having alongitudinal slot in which may play a feather 13, that is fixed t0 theshaft 10, so that the cam-wheel 12 may have free longitudinalmovement'on the shaft 10, but will be forced to revolve with the shaft.

Upon the adjacent faces of the wheels 5 and 12 are arranged interlockingwedge-shaped projections 14 and 15, and the wheel 12 is connected withwheel '5 by a spring 16, one end of the latter being secured at 17 towheel 5 and the other end being secured at 18 to the wheel 12. A lever19 is pivoted at 20 to a fixture of the frame and provided with forks21, hearing against the end of the hub 22 of the cam-wheel 12. Theincoming line-wire terminates in a sprin 24, and 25 represents a wireextending from a terminal spring 26 in any direction, as 27, to theringer.

28 is a metallic piece upon which both the springs 2st and 26 normallyrest, completing the main-line circuit.

The lever 19 is metallic and has connection with one of thegenerator-terminals at 21 and is provided with a contact-point 29,located opposite to the spring 24.

A spring 30, secured to the casing at 31 and provided with a wire 32,leading to the other generator-terminal, stands normallyopposite to thespring 26, and the lever 19 is provided with an insulating-shield 33,adjacent to the spring 39.

The action is as follows: hen an operator turns the crank 9, the cam 12is rotated, and by means of the cam-teeth 14 and 15 the cam is alsowedged longitudinally upon its shaft away from wheel 5 and carries withit the end 21 of lever 19, whereby the contact-point 29 of the samelever raises the spring 24 from the shunt-circuit connection 28, and theinsulated end 33 of the lever 19 raises the spring into contact with thespring 26, also raising that spring from contact with the piece 28. Nowboth poles of the generator are in circuit with the main line and theringer, so that if the revolving of crank 9 be continued the spring 16will be wound taut and pull the main wheel 5 around with it. Thus themagneto-generator will be operated, while electric connection with theringer and line is maintained Without any skill or memory on the part ofthe operator. Then as soon as the crank is released the spring 16 willreturn the cam 12 to its normal position, leaving the lever 19 free, andits return may be insured by a spring 34, acting to disconnect it fromthe springs 24 and 30, whereby the springs 24: and 26 will be permittedto return to connect with the shunt-circuit piece 28, the main-linecircuit will be restored, and the magneto-generator will be cut out atboth sides automatically.

The application of this device to telephonecircuits now in service andhaving magnetobells is very simple and inexpensive and it enables themto be used with greater certainty and with more satisfaction by theunskilled public in general.

Having thus fully described my invention, what I believe to be new, anddesire to secure by Letters Patent, is the following:

1. In electric cut-outs, the emnbination of a main line parted; each ofthe parted ends provided with a spring contactpoint; a me tallicshunt-piece normally in contact with the said spring-points; a thirdspringloeated opposite to one of the said two springs and electricallyconnected with one terminal of a magneto-generator; a lever electricallyconnected with the other terminal of the said generator and providedwith a contact-point located opposite to the other of the said twosprings, and further provided with an insulated shield opposite to thethird spring; a magnetogenerator drive-wheel and a crank therelor havinga shalt loosely connected therewith; a cam-wheel mounted upon thecrank-shaft to be rotated therewith but with free longitudinal movementthereon, the ad jaeent faces of the cam and drive wheel. be ingcam-shaped, spring l'reely connecting the said wheels andan arm. of theaforesaid lever bearing a 'ainst the end of the cam k. if)

